Method and apparatus for summing temperature changes to detect i

Details Method and apparatus for summing temperature changes to detect i Method and apparatus for summing temperature changes to detect i

1993-01-04

1994-05-24

Fuller, Benjamin R.

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

346140R, G01D 900, G01D 1518

Patent

active

053153162

ABSTRACT:
A method and apparatus for detecting ink flow through the printhead of an inkjet pen includes sensing the temperature of the printhead substrate as the inkjet pen prints a test pattern into the printer spittoon. The method includes printing a test pattern and storing data representing the temperature of the printhead. The method includes summing the change in temperature of the printhead between an initial point and points at intervals during the printing of a test pattern to provide a thermal history of the printhead. Ink flow is determined from the rate of temperature change during the printing of a test pattern, and from the change in thermal history of the printhead among test patterns.

REFERENCES:
patent: 4326199 (1982-04-01), Tarpley et al.
patent: 4853718 (1989-08-01), ElHatem et al.
patent: 4910528 (1990-03-01), Firl et al.
patent: 4935751 (1990-06-01), Hamlin
patent: 4940997 (1990-07-01), Hamlin
patent: 4973993 (1990-11-01), Allen
patent: 5206668 (1993-04-01), Lo et al.

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